/*
 * Copyright (c) 2021, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.imageio.plugins.jpeg;

import com.twelvemonkeys.imageio.metadata.jpeg.JPEG;
import com.twelvemonkeys.imageio.stream.ByteArrayImageInputStream;

import javax.imageio.stream.ImageInputStream;
import java.io.DataInput;
import java.io.EOFException;
import java.io.IOException;

/**
 * An EXIF segment.
 *
 * @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
 * @author last modified by $Author: haraldk$
 * @version $Id: JFIFSegment.java,v 1.0 23.04.12 16:52 haraldk Exp$
 */
final class EXIF extends Application {
    EXIF(byte[] data) {
        super(JPEG.APP1, "Exif", data);
    }

    @Override
    public String toString() {
        return String.format("APP1/Exif, length: %d", data.length);
    }

    ImageInputStream exifData() {
        // Identifier is "Exif\0" + 1 byte pad
        int offset = identifier.length() + 2;
        return new ByteArrayImageInputStream(data, offset, data.length - offset);
    }

    public static EXIF read(final DataInput data, int length) throws IOException {
        if (length < 2 + 6) {
            throw new EOFException();
        }

        byte[] bytes = new byte[length - 2];
        data.readFully(bytes);

        return new EXIF(bytes);
    }
}
